Automatic Cord Inserting Structure for a Venetian Blind

Abstract

An automatic cord inserting structure for a venetian blind is fixed on an automatic slat insertion machine including a pushing mechanism and a slat fixing mechanism. The pushing mechanism pushes a slat toward the slat fixing mechanism, and the slat fixing mechanism includes a sliding rack and plural automatic infixing modules. Each automatic infixing module contains: a base having a front face, a rear face, a horizontal slot, and a vertical slot; two limiting pieces for limiting the cord assembly slid in the vertical slot; two abutting pieces fixed in the horizontal slot, and each abutting piece having a lock portion locked on the base and a contacting portion; two elastic units mounted among the base and the two abutting pieces to abut against the two abutting pieces, when the abutting pieces are not pushed by the slat, they are fixed in the horizontal slot.

What is claimed is: 
     
         1 . An automatic cord inserting structure for a venetian blind being fixed on an automatic slat insertion machine for the venetian blind, and the automatic slat insertion machine including a pushing mechanism and a slat fixing mechanism, the pushing mechanism pushing a slat toward the slat fixing mechanism, the slat fixing mechanism including a sliding rack and plural automatic infixing modules arranged on the sliding rack, and each automatic infixing module having:
 a base having a front face, a rear face, a horizontal slot formed on a first top end thereof to insert the slat, and a vertical slot formed on the front face to slide a cord assembly;   two limiting pieces locked on the front face of the base and limiting the cord assembly slid in the vertical slot;   two abutting pieces, each abutting piece having a lock portion and a contacting portion, wherein the lock portion are locked on the base, and the two abutting pieces are normally fixed in the horizontal slot of the base, and when the slat is fixed in the horizontal slat, the two abutting pieces are pushed by the slat to rotate, the two contacting portions of the two abutting pieces extend out of the front face of the base to pull the cord assembly tightly, thus inserting the slat-into the cord assembly; and   two elastic units mounted among the base and the two abutting pieces to abut against the two abutting pieces, and when the abutting pieces are not pushed by the slat, they are fixed in the horizontal slot of the base automatically.   
     
     
         2 . The automatic cord inserting structure for the venetian blind as claimed in  claim 1 , wherein the base of each automatic infixing module also has a left face, a right face, and two through holes defined on the left face and the right face and communicating with the horizontal slot to accommodate the two elastic units. 
     
     
         3 . The automatic cord inserting structure for the venetian blind as claimed in  claim 1 , wherein each limiting piece has a defining portion extending toward a front side of the longitudinal slot of the base to limit the cord assembly slid in the vertical slot. 
     
     
         4 . The automatic cord inserting structure for the venetian blind as claimed in  claim 2 , wherein the two limiting pieces have two shoulders extending toward the left face and the right face of the base to stop the two elastic units removing from the two through holes of the base. 
     
     
         5 . The automatic cord inserting structure for the venetian blind as claimed in  claim 1 , wherein each contacting portion has a first arcuate guiding portion defined on one end thereof away from the lock portion. 
     
     
         6 . The automatic cord inserting -structure for the venetian blind as claimed in  claim 2 , wherein each elastic unit has a resilient resisting element and a spring which are mounted in each through hole of the base, wherein the resilient resisting element is pushed by the spring to push each abutting piece via the horizontal slot of the base. 
     
     
         7 . The automatic cord inserting structure for the venetian blind as claimed in  claim 1 , wherein each contacting portion also has a rotating bar disposed on the one end thereof away from the lock portion. 
     
     
         8 . The automatic cord inserting structure for the venetian blind as claimed in  claim 7 , wherein the rotating bar has a second arcuate guiding portion mounted on a lower corner of one end thereof away from the lock portion.